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Cheap flights from Idaho to London from £260

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 16/4. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LON
18 Mar — 25 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Idaho to London

Enter your travel dates to find the best prices.

Cheapest flights from Idaho to London
Explore the most affordable flight options available from Idaho to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 February 2026.

Sun 5/406:45
IDA
-
LHR
1 stop19h 55m
United Airlines
Tue 21/407:25
LHR
-
IDA
2 stops33h 28m
United Airlines
Deal found 14/2£469
Wed 6/506:00
GEG
-
LHR
2 stops20h 00m
Multiple Airlines
Wed 20/506:55
LHR
-
GEG
2 stops22h 21m
Multiple Airlines
Deal found 15/2£471
Tue 28/413:53
BOI
-
LHR
1 stop17h 32m
Iberia
Tue 5/507:50
LHR
-
BOI
2 stops20h 17m
Iberia
Deal found 12/2£472
Tue 7/410:40
IDA
-
LHR
1 stop16h 00m
United Airlines
Tue 14/407:25
LHR
-
IDA
2 stops33h 28m
United Airlines
Deal found 15/2£475
Tue 21/407:20
JAC
-
LHR
1 stop20h 40m
Scandinavian Airlines
Mon 27/408:40
LHR
-
JAC
2 stops41h 21m
Scandinavian Airlines
Deal found 15/2£475
Sun 19/417:29
BOI
-
LHR
1 stop11h 51m
United Airlines
Tue 28/406:55
LHR
-
BOI
2 stops19h 58m
United Airlines
Deal found 15/2£475
Wed 6/506:20
GEG
-
LHR
1 stop24h 40m
Virgin Atlantic
Wed 20/511:45
LHR
-
GEG
2 stops19h 12m
Virgin Atlantic
Deal found 15/2£475
Sun 19/406:15
BOI
-
LHR
2 stops17h 15m
United Airlines
Thu 30/409:00
LHR
-
BOI
2 stops20h 35m
United Airlines
Deal found 15/2£477
Mon 27/420:40
BOI
-
LHR
2 stops16h 30m
Delta
Thu 7/506:30
LHR
-
BOI
2 stops20h 45m
Delta
Deal found 15/2£478
Tue 21/410:35
BOI
-
LHR
2 stops17h 05m
United Airlines
Tue 28/407:25
LHR
-
BOI
2 stops19h 28m
United Airlines
Deal found 15/2£479
Mon 27/415:44
BOI
-
LGW
2 stops17h 01m
Delta
Tue 5/510:35
LGW
-
BOI
2 stops17h 49m
Delta
Deal found 15/2£483
Sat 25/419:03
BOI
-
LHR
1 stop29h 22m
United Airlines
Tue 5/507:30
LHR
-
BOI
2 stops20h 47m
United Airlines
Deal found 15/2£483

Find flight deals from Idaho to London

Keep the following information in mind while searching for Idaho to London flight deals. Data was last updated 16 February 2026.

Round-trip from

£469

One-way from

£260

Popular in

January

Cheapest in

October

Average price

£753
United Airlines
  • United Airlines
  • 5/4-21/4
  • 3 total stops
  • 53h 23m total
  • Idaho to London
Search Deals
16/4
  • 16/4
  • 3 total stops
  • 50h 25m total
  • Idaho to London
Search Deals
Highest demand for flights based on searches. 22% potential increase in price (£159 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease (£47 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Idaho to London that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 16 February 2026.
Use the filters below to find and compare flights from Idaho to London that are best for you.

Fly from

Idaho

Fly to

London

Route

Depart

Return

Price

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Sun 5/4

06:45-09:40

1 stop19h 55m

London Heathrow

Tue 21/4

07:25-09:53

2 stops33h 28m

£469

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 22/4

16:55-15:00

1 stop15h 05m

London Heathrow

Wed 29/4

11:45-21:24

2 stops16h 39m

£475

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 7/4

10:40-09:40

1 stop16h 00m

London Heathrow

Tue 14/4

07:25-09:53

2 stops33h 28m

£475

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 21/4

10:35-12:20

1 stop18h 45m

London Heathrow

Thu 30/4

09:00-22:35

2 stops20h 35m

£475

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Sat 18/4

19:03-07:25

1 stop29h 22m

London Heathrow

Thu 30/4

09:00-22:35

2 stops20h 35m

£475

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 22/4

17:29-12:20

1 stop11h 51m

London Heathrow

Thu 30/4

09:00-22:35

2 stops20h 35m

£475

JacksonLondon

JAC - LHR

JACLHR

Jackson Hole

Tue 21/4

13:00-13:15

2 stops17h 15m

London Heathrow

Mon 27/4

08:40-19:01

2 stops41h 21m

£478

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 28/4

10:45-13:15

2 stops19h 30m

London Heathrow

Wed 6/5

09:55-21:24

2 stops18h 29m

£478

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 21/4

10:35-10:40

2 stops17h 05m

London Heathrow

Tue 28/4

07:25-19:53

2 stops19h 28m

£479

BoiseLondon

BOI - LGW

BOILGW

Boise Air Term. Gowen Fld

Mon 27/4

15:44-15:45

2 stops17h 01m

London Gatwick

Tue 5/5

10:35-21:24

2 stops17h 49m

£483

Flights are sorted by cheapest return flights first.

Deals found on 14/2

Showing 1-10 of 60 results
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Best time to book a flight from Idaho to London

Have a flexible travel schedule? Discover the best time to fly to London from Idaho with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Idaho to London

What is the cheapest month to book a flight from Idaho to London?

Currently, October is the cheapest month in which you can book a flight from Idaho to London (average of £455). Flying from Idaho to London in June is currently the most expensive (average of £794). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost for a return flight from Idaho to London?

Related info for your journey

Find useful and relevant information for your journey from Idaho to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Idaho to London?

    A quick flight from Idaho to London can take about 15h 05m. United Airlines provides one of the quickest options available for as low as £475. The distance from Idaho to London is about 4829 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the most popular routes from Idaho to London?

    While some choose either Spokane - London Gatwick or Boise Air Term. Gowen Fld - London Heathrow, Spokane - London Heathrow is the most popular route from Idaho to London.

  • Can I find deals for flights from Idaho to London that include hotel bookings?

    Yes. In addition to deals on Idaho to London flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Idaho to London?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Idaho to London.

  • Can I find deals for business class flights from Idaho to London?

    Yes. Cheapflights offers flight deals from Idaho to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Idaho to London?

    Currently, October is the cheapest month in which you can book a flight from Idaho to London (average of £455). Flying from Idaho to London in June is currently the most expensive (average of £794). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
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Croydon
Luton
Wembley
Gatwick
Slough
Hounslow
Ilford
Hayes
Brentford
Colchester
Watford
Guildford
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Crawley
Kingston upon Thames
Ipswich
Bedford
Romford

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Alternative routes for Idaho to London

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Fly with Cheapflights

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How does Cheapflights help users find flights from Idaho to London?

When you search for this flight from Idaho to London, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Idaho to London?

Millions of users choose and trust Cheapflights to book the best flight deals from Idaho to London for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Idaho to London with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Idaho to London flexibly with Cheapflights today.

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Of course! You can now track prices for flights from Idaho to London and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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